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<div id="dev-warning" class="admonition note">
  <p class="first admonition-title">Notice</p>
  <p class="last">This document is for a development version of Ceph.</p>
</div>
  <div id="docubetter" align="right" style="padding: 5px; font-weight: bold;">
    <a href="https://pad.ceph.com/p/Report_Documentation_Bugs">Report a Documentation Bug</a>
  </div>

  
  <section id="migrate">
<span id="ceph-volume-lvm-migrate"></span><h1><code class="docutils literal notranslate"><span class="pre">migrate</span></code><a class="headerlink" href="#migrate" title="Permalink to this heading"></a></h1>
<p>Moves BlueFS data from source volume(s) to the target one, source volumes
(except the main, i.e. data or block one) are removed on success.</p>
<p>LVM volumes are permitted for Target only, both already attached or new one.</p>
<p>In the latter case it is attached to the OSD replacing one of the source
devices.</p>
<p>Following replacement rules apply (in the order of precedence, stop
on the first match):</p>
<blockquote>
<div><ul class="simple">
<li><p>if source list has DB volume - target device replaces it.</p></li>
<li><p>if source list has WAL volume - target device replaces it.</p></li>
<li><p>if source list has slow volume only - operation is not permitted,
requires explicit allocation via new-db/new-wal command.</p></li>
</ul>
</div></blockquote>
<p>Moves BlueFS data from main device to LV already attached as DB:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">data</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">db</span>
</pre></div>
</div>
<p>Moves BlueFS data from shared main device to LV which will be attached as a
new DB:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">data</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">new_db</span>
</pre></div>
</div>
<p>Moves BlueFS data from DB device to new LV, DB is replaced:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">db</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">new_db</span>
</pre></div>
</div>
<p>Moves BlueFS data from main and DB devices to new LV, DB is replaced:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">data</span> <span class="n">db</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">new_db</span>
</pre></div>
</div>
<p>Moves BlueFS data from main, DB and WAL devices to new LV, WAL is  removed and
DB is replaced:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">data</span> <span class="n">db</span> <span class="n">wal</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">new_db</span>
</pre></div>
</div>
<p>Moves BlueFS data from main, DB and WAL devices to main device, WAL and DB are
removed:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span><span class="o">-</span><span class="n">volume</span> <span class="n">lvm</span> <span class="n">migrate</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="nb">id</span> <span class="mi">1</span> <span class="o">--</span><span class="n">osd</span><span class="o">-</span><span class="n">fsid</span> <span class="o">&lt;</span><span class="n">uuid</span><span class="o">&gt;</span> <span class="o">--</span><span class="kn">from</span> <span class="nn">db</span> <span class="n">wal</span> <span class="o">--</span><span class="n">target</span> <span class="n">vgname</span><span class="o">/</span><span class="n">data</span>
</pre></div>
</div>
</section>



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